A High-Performance Photovoltaic Module-Integrated Converter (MIC) Based on Cascaded Quasi-Z-Source Inverters (qZSI) Using eGaN FETs

Zhou, Yan; Liu, Liming; Li, Hui

doi:10.1109/tpel.2012.2219556

Cited by 222 publications

(84 citation statements)

References 15 publications

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“…In single-phase qZSIs [8][9][10][11][12][13][14][15][16] and single-phase qSBIs [20][21][22][23][24], a simple boost PWM control method is usually used. In this method, a constant voltage is compared to a triangle waveform to generate a control signal for the shoot-through state.…”

Section: Proposed Maximum Boost Control Methods For Single-phase Switcmentioning

confidence: 99%

“…Four basic CB-PWM control techniques, namely simple boost control [1], maximum boost control [2], maximum constant boost control [3], and modified SV-PWM methods [6,7] for three-phase ZSIs were compared in [8]. For single-phase ZSIs, most PWM controls use the simple boost control method [9][10][11][12][13][14][15][16]. In the simple boost control method, a constant voltage is compared to a high frequency triangle waveform to generate a fixed shoot-through control signal.…”

Section: Introductionmentioning

confidence: 99%

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Maximum Boost Control Method for Single-Phase Quasi-Switched-Boost and Quasi-Z-Source Inverters

Nguyen

Choi

2017

Energies

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Abstract:The maximum boost control method for a single-phase switched-boost inverter (SBI) and single-phase Z-source inverter (ZSI) is proposed in this paper. In the proposed method, the low frequency voltage is added to the constant voltage for generating the variable shoot-through time intervals. For improving the AC output quality of the inverter, an active power switch is used to replace one of the diodes in the single-phase SBI. The operating principles and circuit analysis using the proposed maximum boost control method for single-phase inverters are presented. Laboratory prototypes are built to verify the operation of the proposed pulse-width modulation (PWM) control method for both single-phase quasi-ZSI and single-phase quasi-SBI.

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Section: Proposed Maximum Boost Control Methods For Single-phase Switcmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Maximum Boost Control Method for Single-Phase Quasi-Switched-Boost and Quasi-Z-Source Inverters

Nguyen

Choi

2017

Energies

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“…This dc injection would result in even harmonics being drawn from the grid, again contributing to a lower power quality. It is important to attenuate these harmonics in order for the PV inverter to meet standards such as IEEE 519-1992 [7] and IEEE 1547-2003 [8]. Hence, this paper concentrates on the design of the inverter current control to achieve a good attenuation of the lower order harmonics.…”

Section: Introductionmentioning

confidence: 99%

Adaptive Harmonic Elimination in a Grid-Connected Three-Phase PV Inverter

Sekhar¹

2017

ijecs

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Abstract-In this paper, a simple three-phase grid-connected photovoltaic (PV) inverter topology consisting of a boost section, a low-voltage three-phase inverter with an inductive filter, and a step-up transformer interfacing the grid is considered. Ideally, this topology will not inject any lower order harmonics into the grid due to high-frequency pulse width modulation operation. However, the non-ideal factors in the system such as core saturation-induced distorted magnetizing current of the transformer and the dead time of the inverter, etc., contribute to a significant amount of lower order harmonics in the grid current. A novel design of inverter current control that mitigates lower order harmonics is presented in this paper. An adaptive harmonic compensation technique and its design are proposed for the lower order harmonic compensation. In addition, a proportionalresonant-integral (PRI) controller and its design are also proposed. This controller eliminates the dc component in the control system, which introduces even harmonics in the grid current in the topology considered. The dynamics of the system due to the interaction between the PRI controller and the adaptive compensation scheme is also analyzed. The proposed system is simulated in MATLAB/SIMULINK platform Index Terms-DC-link voltage, Zero voltage switching, Renewable Energy (RE), Proportional Resonant Integral (PRI). I. INTRODUCTIONRenewable sources of energy such as solar, wind, and geothermal have gained popularity due to the depletion of conventional energy sources. Hence, many distributed generation (DG) systems making use of the renewable energy sources are being designed and connected to a grid. In this project, one such DG system with solar energy as the source is considered. The topology of the solar inverter system is simple. It consists of the following three power circuit stages: 1) a boost converter stage to perform maximum power point tracking (MPPT); 2) a low-voltage single-phase H-bridge inverter; 3) an inductive filter and a step-up transformer for interfacing with the grid. Fig.1 shows the power circuit topology considered. This topology has been chosen due to the following advantages: The switches are all rated for low voltage which reduces the cost and lesser component count in the system improves the overall reliability. This topology will be a good choice for low-rated PV inverters of rating less than a kilowatt. The disadvantage would be the relatively larger size of the interface transformer compared to topologies with a high-frequency link transformer. The system shown in Fig. 1 will not have any lower order harmonics in the ideal case. However, the following factors result in lower order harmonics in the system: The distorted magnetizing current drawn by the transformer due to the nonlinearity in the B-H curve of the transformer core, the dead time introduced between switching of devices of the same leg [2]-[6], on-state voltage drops on the switches, and the distortion in the grid voltage itself. There can be a dc inject...

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“…Therefore, electrolytic capacitors are considered to be the weak component regarding to lifetime, especially under outdoor operation conditions. Accurate analytical models to calculate the DFR for qZSI have been developed in [8], [15], and [16] and the design guidelines for selecting the capacitance to limit the DFR are also provided. Nevertheless, the required capacitance is still large.…”

Section: Introductionmentioning

confidence: 99%

A Grid Connected Three Phase PV Quasi-Z-Source Inverter with Double Frequency Ripple Suppression Control

Chalasani¹

2017

ijecs

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Abstract-In a Grid connected three-phase photovoltaic (PV) system, there is double-frequency power mismatch existed between the dc input and ac output. The double-frequency ripple (DFR) energy needs to be buffered by passive network. Otherwise, the ripple energy will flow into the input side and adversely affect the PV energy harvest. In a conventional PV system, electrolytic capacitors are usually used for this purpose due to their high capacitance. However, electrolytic capacitors are considered to be one of the most failure prone components in a PV inverter. In this project, a capacitance reduction control strategy is proposed to buffer the DFR energy in three-phase Z-source/quasi-Z-source inverter applications. Without using any extra hardware components, the proposed control strategy can significantly reduce the capacitance requirement and achieve low input voltage DFR. Consequently, highly reliable film capacitors can be used. The increased switching device voltage stress and power loss due to the proposed control strategy will also be discussed. The proposed system is simulated in MATLAB/Simulink platform.Index Terms-DC-link voltage balance, Zero voltage switching, Renewable Energy (RE).

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A High-Performance Photovoltaic Module-Integrated Converter (MIC) Based on Cascaded Quasi-Z-Source Inverters (qZSI) Using eGaN FETs

Cited by 222 publications

References 15 publications

Maximum Boost Control Method for Single-Phase Quasi-Switched-Boost and Quasi-Z-Source Inverters

Maximum Boost Control Method for Single-Phase Quasi-Switched-Boost and Quasi-Z-Source Inverters

Adaptive Harmonic Elimination in a Grid-Connected Three-Phase PV Inverter

A Grid Connected Three Phase PV Quasi-Z-Source Inverter with Double Frequency Ripple Suppression Control

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